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<h1 class="mume-header" id="%E5%AE%9E%E9%AA%8C%E5%9B%9B">实验四</h1>
<h2 class="mume-header" id="12%E5%B8%B8%E7%94%A8%E7%B3%BB%E7%BB%9F%E4%B8%AD%E6%96%AD%E7%9A%84%E4%BD%BF%E7%94%A8">(1/2)常用系统中断的使用</h2>
<h3 class="mume-header" id="%E4%B8%80-%E5%9F%BA%E7%A1%80%E6%80%A7%E5%AE%9E%E9%AA%8C">一. 基础性实验</h3>
<h4 class="mume-header" id="1-%E5%AE%9E%E9%AA%8C%E7%9B%AE%E7%9A%84">1. 实验目的</h4>
<ol>
<li>掌握在 <strong>DOS</strong> 中对屏幕和键盘中断的调用方法.</li>
<li>掌握在 <strong>BIOS</strong> 中对屏幕和键盘中断的调用方法.</li>
</ol>
<h4 class="mume-header" id="2-%E5%AE%9E%E9%AA%8C%E5%86%85%E5%AE%B9">2. 实验内容</h4>
<p>在屏幕上显示背景色为白色,前景色不同的 <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>16</mn></mrow><annotation encoding="application/x-tex">16</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.64444em;vertical-align:0em;"></span><span class="mord">16</span></span></span></span> 个字符 <code>A</code>.</p>
<h4 class="mume-header" id="3-%E5%AE%9E%E9%AA%8C%E4%BB%AA%E5%99%A8%E8%AE%BE%E5%A4%87">3. 实验仪器设备</h4>
<ul>
<li>硬件环境: AMD Ryzen 9.</li>
<li>软件环境: Windows XP Pro SP3 (in VMware Workstation 16 Pro).</li>
<li>编辑程序: Visual Studio Code 1.62.3.</li>
<li>调试程序: <code>DEBUG.EXE</code>.</li>
<li>编译程序: <code>MASM.EXE</code>.</li>
<li>连接程序: <code>LINK.EXE</code>.</li>
</ul>
<h4 class="mume-header" id="4-%E5%AE%9E%E9%AA%8C%E6%AD%A5%E9%AA%A4">4. 实验步骤</h4>
<ol>
<li>检查并修改原程序</li>
<li>编译和连接<br>
<img src="./7/7-1.png" alt></li>
<li>用单步方式运行程序</li>
</ol>
<pre data-role="codeBlock" data-info="batch" class="language-batch"><span class="token command"><span class="token keyword keyword-debug">debug</span> <span class="token number">7</span><span class="token number">-1</span>.exe</span>
</pre><pre data-role="codeBlock" data-info="py" class="language-python"><span class="token operator">-</span>t
</pre><ol start="4">
<li>检查并记录各寄存器和存储单元内容的变化<br>
<img src="./7/7-2.png" alt></li>
</ol>
<h4 class="mume-header" id="5-%E6%80%9D%E8%80%83%E9%A2%98">5. 思考题</h4>
<h5 class="mume-header" id="1-%E8%8B%A5%E8%A6%81%E5%B0%86%E7%A8%8B%E5%BA%8F%E4%B8%AD%E7%9A%84%E5%AD%97%E7%AC%A6%E4%BB%A5%E6%96%9C%E7%BA%BF%E6%96%B9%E5%BC%8F%E6%98%BE%E7%A4%BA%E5%BA%94%E8%AF%A5%E5%A6%82%E4%BD%95%E4%BF%AE%E6%94%B9%E6%8C%87%E4%BB%A4">(1) 若要将程序中的字符以斜线方式显示,应该如何修改指令?</h5>
<p>可使用 <strong>ANSI</strong> 控制符 <code>\x1b[3m</code> 使后文成为斜体.</p>
<pre data-role="codeBlock" data-info="nasm" class="language-nasm">DATA SEGMENT
ANSI DB <span class="token number">1BH</span>,<span class="token string">"[3m"</span>,<span class="token string">"$"</span>
DATA ENDS
CODE SEGMENT
ASSUME <span class="token register variable">CS</span>:CODE,<span class="token register variable">DS</span>:DATA
<span class="token label function">START:</span> MOV <span class="token register variable">AX</span>,DATA
MOV <span class="token register variable">DS</span>,<span class="token register variable">AX</span>
MOV <span class="token register variable">AH</span>,<span class="token number">9</span>
MOV <span class="token register variable">DX</span>,OFFSET ANSI
INT <span class="token number">21H</span>
MOV <span class="token register variable">AL</span>,<span class="token string">'A'</span>
MOV <span class="token register variable">DX</span>,<span class="token number">10H</span>
MOV <span class="token register variable">BL</span>,<span class="token number">0F0H</span>
<span class="token label function">A1:</span> PUSH <span class="token register variable">DX</span>
MOV <span class="token register variable">AH</span>,<span class="token number">9</span>
MOV <span class="token register variable">BH</span>,<span class="token number">0</span>
MOV <span class="token register variable">CX</span>,<span class="token number">1</span>
INT <span class="token number">10H</span>
MOV <span class="token register variable">AH</span>,<span class="token number">3</span>
MOV <span class="token register variable">BH</span>,<span class="token number">0</span>
INT <span class="token number">10H</span>
INC <span class="token register variable">DL</span>
MOV <span class="token register variable">AH</span>,<span class="token number">2</span>
INT <span class="token number">10H</span>
ADD <span class="token register variable">BL</span>,<span class="token number">1</span>
POP <span class="token register variable">DX</span>
DEC <span class="token register variable">DX</span>
JNZ A1
MOV <span class="token register variable">AH</span>,<span class="token number">4CH</span>
INT <span class="token number">21H</span>
CODE ENDS
END START
</pre><p>常见现代终端如 <strong>Konsole</strong>, <strong>Windows Terminal</strong> 均支持 <strong>ANSI</strong>, 但如 <strong>Dosbox</strong> 和 <strong>CMD</strong> 原生终端均不支持.<br>
<img src="./7/7-3.png" alt><br>
在 <strong>Windows XP</strong> 中,可通过编辑配置文件使 <strong>CMD</strong> 原生终端部分支持 <strong>ANSI</strong>:</p>
<pre data-role="codeBlock" data-info="batch" class="language-batch"><span class="token command"><span class="token keyword keyword-echo">echo</span> <span class="token string">"Please run as Administrator."</span></span>
<span class="token command"><span class="token keyword keyword-echo">echo</span> <span class="token string">"device=%SystemRoot%\system32\ansi.sys"</span> >> C:\WINDOWS\system32\CONFIG.NT</span>
<span class="token command"><span class="token keyword keyword-echo">echo</span> <span class="token string">"Please reboot."</span></span>
<span class="token command"><span class="token keyword keyword-pause">pause</span></span>
</pre><p>但由于字体缺失,斜体和非斜体显示效果相同.<br>
因此,为方便查看结果,决定将所有输出输出到标准输出.</p>
<pre data-role="codeBlock" data-info="nasm" class="language-nasm">DATA SEGMENT
ANSI DB <span class="token number">1BH</span>,<span class="token string">"[256F"</span>,<span class="token number">1BH</span>,<span class="token string">"[0J"</span>,<span class="token number">1BH</span>,"<span class="token operator">[</span><span class="token number">3</span><span class="token comment">;107mA",1BH,"[30mA",1BH,"[31mA",1BH,"[32mA",1BH,"[33mA",1BH,"[34mA",1BH,"[35mA",1BH,"[36mA",1BH,"[90mA",1BH,"[91mA",1BH,"[92mA",1BH,"[93mA",1BH,"[94mA",1BH,"[95mA",1BH,"[96mA",1BH,"[97mA",1BH,"[0m",0AH,"$"</span>
DATA ENDS
CODE SEGMENT
ASSUME <span class="token register variable">CS</span>:CODE,<span class="token register variable">DS</span>:DATA
<span class="token label function">START:</span> MOV <span class="token register variable">AX</span>,DATA
MOV <span class="token register variable">DS</span>,<span class="token register variable">AX</span>
MOV <span class="token register variable">AH</span>,<span class="token number">9</span>
MOV <span class="token register variable">DX</span>,OFFSET ANSI
INT <span class="token number">21H</span>
MOV <span class="token register variable">AH</span>,<span class="token number">4CH</span>
INT <span class="token number">21H</span>
CODE ENDS
END START
</pre><p>运行时进行输出重定向:</p>
<pre data-role="codeBlock" data-info="batch" class="language-batch"><span class="token command"><span class="token keyword keyword-7">7</span><span class="token number">-3</span> <span class="token number">2</span>></span><span class="token operator">&</span><span class="token command"><span class="token keyword keyword-1">1</span> <span class="token number">1</span>><span class="token number">7</span><span class="token number">-3</span>.out</span>
</pre><p>最后在现代终端中查看:</p>
<pre data-role="codeBlock" data-info="batch" class="language-batch"><span class="token command"><span class="token keyword keyword-cat">cat</span> ./<span class="token number">7</span><span class="token number">-3</span>.out</span>
</pre><p><img src="./7/7-4.png" alt></p>
<h3 class="mume-header" id="%E4%BA%8C-%E5%8A%A0%E5%BC%BA%E5%9E%8B%E5%AE%9E%E9%AA%8C">二. 加强型实验</h3>
<h4 class="mume-header" id="1-%E5%AE%9E%E9%AA%8C%E7%9B%AE%E7%9A%84-1">1. 实验目的</h4>
<p>进一步掌握在 <strong>BIOS</strong> 中对屏幕和键盘中断的调用方法.</p>
<h4 class="mume-header" id="2-%E5%AE%9E%E9%AA%8C%E5%86%85%E5%AE%B9-1">2. 实验内容</h4>
<p>利用视频显示调用,实现简单的动画,在屏幕上显示一个水平开动的汽车.</p>
<h4 class="mume-header" id="3-%E5%AE%9E%E9%AA%8C%E4%BB%AA%E5%99%A8%E8%AE%BE%E5%A4%87-1">3. 实验仪器设备</h4>
<ul>
<li>硬件环境: AMD Ryzen 9.</li>
<li>软件环境: Windows XP Pro SP3 (in VMware Workstation 16 Pro).</li>
<li>编辑程序: Visual Studio Code 1.62.3.</li>
<li>调试程序: <code>DEBUG.EXE</code>.</li>
<li>编译程序: <code>MASM.EXE</code>.</li>
<li>连接程序: <code>LINK.EXE</code>.</li>
</ul>
<h4 class="mume-header" id="4-%E5%AE%9E%E9%AA%8C%E6%AD%A5%E9%AA%A4-1">4. 实验步骤</h4>
<ol>
<li>检查并修改原程序</li>
<li>编译和连接<br>
<img src="./7/7-5.png" alt></li>
<li>用单步方式运行程序</li>
</ol>
<pre data-role="codeBlock" data-info="batch" class="language-batch"><span class="token command"><span class="token keyword keyword-debug">debug</span> <span class="token number">5</span><span class="token number">-2</span>.exe</span>
</pre><pre data-role="codeBlock" data-info="py" class="language-python"><span class="token operator">-</span>t
</pre><ol start="4">
<li>检查并记录各寄存器和存储单元内容的变化<br>
<img src="./7/7-6.png" alt></li>
</ol>
<h2 class="mume-header" id="22%E4%B8%AD%E6%96%AD%E5%A4%84%E7%90%86%E7%A8%8B%E5%BA%8F%E8%AE%BE%E8%AE%A1">(2/2)中断处理程序设计</h2>
<h3 class="mume-header" id="%E4%B8%80-%E5%9F%BA%E7%A1%80%E6%80%A7%E5%AE%9E%E9%AA%8C-1">一. 基础性实验</h3>
<h4 class="mume-header" id="1-%E5%AE%9E%E9%AA%8C%E7%9B%AE%E7%9A%84-2">1. 实验目的</h4>
<ol>
<li>学习和了解汇编语言程序设计中有关中断处理的相关知识.</li>
<li>了解汇编语言程序设计中软中断的基本编写步骤.</li>
</ol>
<h4 class="mume-header" id="2-%E5%AE%9E%E9%AA%8C%E5%86%85%E5%AE%B9-2">2. 实验内容</h4>
<ol>
<li>编写一个中断处理程序,当主程序中除法指令除数为 <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>0</mn></mrow><annotation encoding="application/x-tex">0</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.64444em;vertical-align:0em;"></span><span class="mord">0</span></span></span></span> 时,显示字符串<code>ERROR!DIVIDE BY ZERO!</code>, 并将除数置为 <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>3.</mn></mrow><annotation encoding="application/x-tex">3.</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.64444em;vertical-align:0em;"></span><span class="mord">3.</span></span></span></span></li>
<li>为了验证该中断处理程序是否有效,编写一个主程序,做 <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>10</mn></mrow><annotation encoding="application/x-tex">10</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.64444em;vertical-align:0em;"></span><span class="mord">10</span></span></span></span> 次 <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>9</mn><mi mathvariant="normal">/</mi><mi mathvariant="normal">B</mi><mi mathvariant="normal">L</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">\rm9/BL,</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord"><span class="mord mathrm">9/BL</span><span class="mpunct">,</span></span></span></span></span> 在屏幕上显示商 <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mo separator="true">,</mo><mi mathvariant="normal">B</mi><mi mathvariant="normal">L</mi></mrow><annotation encoding="application/x-tex">\rm,BL</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8777699999999999em;vertical-align:-0.19444em;"></span><span class="mord"><span class="mpunct">,</span><span class="mspace" style="margin-right:0.16666666666666666em;"></span><span class="mord mathrm">BL</span></span></span></span></span> 中初始数据为 <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>6</mn><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">6,</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8388800000000001em;vertical-align:-0.19444em;"></span><span class="mord">6</span><span class="mpunct">,</span></span></span></span> 每除一次 <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mo separator="true">,</mo><mi mathvariant="normal">B</mi><mi mathvariant="normal">L</mi></mrow><annotation encoding="application/x-tex">\rm,BL</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8777699999999999em;vertical-align:-0.19444em;"></span><span class="mord"><span class="mpunct">,</span><span class="mspace" style="margin-right:0.16666666666666666em;"></span><span class="mord mathrm">BL</span></span></span></span></span> 中除数 <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mo>−</mo><mn>1.</mn></mrow><annotation encoding="application/x-tex">-1.</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.72777em;vertical-align:-0.08333em;"></span><span class="mord">−</span><span class="mord">1.</span></span></span></span></li>
</ol>
<h4 class="mume-header" id="3-%E5%AE%9E%E9%AA%8C%E4%BB%AA%E5%99%A8%E8%AE%BE%E5%A4%87-2">3. 实验仪器设备</h4>
<ul>
<li>硬件环境: AMD Ryzen 9.</li>
<li>软件环境: Windows XP Pro SP3 (in VMware Workstation 16 Pro).</li>
<li>编辑程序: Visual Studio Code 1.62.3.</li>
<li>调试程序: <code>DEBUG.EXE</code>.</li>
<li>编译程序: <code>MASM.EXE</code>.</li>
<li>连接程序: <code>LINK.EXE</code>.</li>
</ul>
<h4 class="mume-header" id="4-%E5%AE%9E%E9%AA%8C%E6%AD%A5%E9%AA%A4-2">4. 实验步骤</h4>
<ol>
<li>检查并修改原程序<br>
原程序当出现除数为 <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>0</mn></mrow><annotation encoding="application/x-tex">0</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.64444em;vertical-align:0em;"></span><span class="mord">0</span></span></span></span> 时,会显示错误提示,然后结束程序.<br>
<code>A2</code> 中处理完中断后返回 <code>A1</code> 即可.<br>
为不影响循环次数,使用 <code>LOOP A1</code>.</li>
</ol>
<pre data-role="codeBlock" data-info="nasm" class="language-nasm">DATA SEGMENT
STRING DB <span class="token string">'ERROR!DIVIDE BY ZERO!'</span>,<span class="token number">0AH</span>,<span class="token number">0DH</span>,<span class="token string">'$'</span>
CODE SEGMENT
ASSUME <span class="token register variable">CS</span>:CODE,<span class="token register variable">DS</span>:DATA
MAIN PROC FAR
LEA <span class="token register variable">DX</span>,INT0
MOV <span class="token register variable">AX</span>,<span class="token register variable">CS</span>
MOV <span class="token register variable">DS</span>,<span class="token register variable">AX</span>
MOV <span class="token register variable">AL</span>,<span class="token number">32</span>
MOV <span class="token register variable">AH</span>,<span class="token number">25H</span>
INT <span class="token number">21H</span>
MOV <span class="token register variable">AX</span>,DATA
MOV <span class="token register variable">DS</span>,<span class="token register variable">AX</span>
MOV <span class="token register variable">CX</span>,<span class="token number">10</span>
MOV <span class="token register variable">BL</span>,<span class="token number">6</span>
<span class="token label function">A1:</span> MOV <span class="token register variable">AX</span>,<span class="token number">9</span>
DIV <span class="token register variable">BL</span>
ADD <span class="token register variable">AL</span>,<span class="token number">30H</span>
MOV <span class="token register variable">DL</span>,<span class="token register variable">AL</span>
MOV <span class="token register variable">AH</span>,<span class="token number">2</span>
INT <span class="token number">21H</span>
MOV <span class="token register variable">DL</span>,<span class="token number">0DH</span>
MOV <span class="token register variable">AH</span>,<span class="token number">2</span>
INT <span class="token number">21H</span>
MOV <span class="token register variable">DL</span>,<span class="token number">0AH</span>
MOV <span class="token register variable">AH</span>,<span class="token number">2</span>
INT <span class="token number">21H</span>
DEC <span class="token register variable">BL</span>
CMP <span class="token register variable">BL</span>,<span class="token number">0</span>
JZ A2
LOOP A1
<span class="token label function">A3:</span> MOV <span class="token register variable">AH</span>,<span class="token number">4CH</span>
INT <span class="token number">21H</span>
<span class="token label function">A2:</span> INT <span class="token number">32</span>
LOOP A1
MAIN ENDP
INT0 PROC FAR
LEA <span class="token register variable">DX</span>,STRING
MOV <span class="token register variable">AH</span>,<span class="token number">9</span>
INT <span class="token number">21H</span>
MOV <span class="token register variable">BL</span>,<span class="token number">3</span>
IRET
INT0 ENDP
CODE ENDS
END MAIN
</pre><ol>
<li>编译和连接</li>
<li>用单步方式运行程序</li>
</ol>
<pre data-role="codeBlock" data-info="batch" class="language-batch"><span class="token command"><span class="token keyword keyword-debug">debug</span> <span class="token number">8</span><span class="token number">-1</span>.exe</span>
</pre><pre data-role="codeBlock" data-info="py" class="language-python"><span class="token operator">-</span>t
</pre><ol start="3">
<li>检查并记录各寄存器和存储单元内容的变化</li>
<li>将上述主程序与子程序编辑为一个文件,生成 <code>.EXE</code> 文件后执行,察看结果.<br>
<img src="./8/8-1.png" alt></li>
</ol>
<h4 class="mume-header" id="5-%E6%80%9D%E8%80%83%E9%A2%98-1">5. 思考题</h4>
<h5 class="mume-header" id="1-%E5%AF%B9%E4%B8%AD%E6%96%AD%E5%A4%84%E7%90%86%E5%AD%90%E7%A8%8B%E5%BA%8F%E5%81%9A%E4%BF%AE%E6%94%B9%E5%AE%9E%E7%8E%B0%E5%BD%93%E5%87%BA%E7%8E%B0%E9%99%A4%E6%95%B0%E4%B8%BA-0-%E6%97%B6%E6%98%BE%E7%A4%BA%E9%94%99%E8%AF%AF%E6%8F%90%E7%A4%BA%E7%84%B6%E5%90%8E%E7%BB%93%E6%9D%9F%E7%A8%8B%E5%BA%8F-%E8%BF%99%E6%97%B6%E5%BA%94%E8%AF%A5%E4%BF%AE%E6%94%B9%E7%A8%8B%E5%BA%8F%E4%B8%AD%E7%9A%84%E4%BB%80%E4%B9%88%E5%9C%B0%E6%96%B9">(1) 对中断处理子程序做修改,实现当出现除数为 <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>0</mn></mrow><annotation encoding="application/x-tex">0</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.64444em;vertical-align:0em;"></span><span class="mord">0</span></span></span></span> 时,显示错误提示，然后结束程序. 这时,应该修改程序中的什么地方?</h5>
<p><code>A2</code> 中处理完中断后跳转到 <code>A3</code> 即可.</p>
<pre data-role="codeBlock" data-info="nasm" class="language-nasm">DATA SEGMENT
STRING DB <span class="token string">'ERROR!DIVIDE BY ZERO!'</span>,<span class="token number">0AH</span>,<span class="token number">0DH</span>,<span class="token string">'$'</span>
CODE SEGMENT
ASSUME <span class="token register variable">CS</span>:CODE,<span class="token register variable">DS</span>:DATA
MAIN PROC FAR
LEA <span class="token register variable">DX</span>,INT0
MOV <span class="token register variable">AX</span>,<span class="token register variable">CS</span>
MOV <span class="token register variable">DS</span>,<span class="token register variable">AX</span>
MOV <span class="token register variable">AL</span>,<span class="token number">32</span>
MOV <span class="token register variable">AH</span>,<span class="token number">25H</span>
INT <span class="token number">21H</span>
MOV <span class="token register variable">AX</span>,DATA
MOV <span class="token register variable">DS</span>,<span class="token register variable">AX</span>
MOV <span class="token register variable">CX</span>,<span class="token number">10</span>
MOV <span class="token register variable">BL</span>,<span class="token number">6</span>
<span class="token label function">A1:</span> MOV <span class="token register variable">AX</span>,<span class="token number">9</span>
DIV <span class="token register variable">BL</span>
ADD <span class="token register variable">AL</span>,<span class="token number">30H</span>
MOV <span class="token register variable">DL</span>,<span class="token register variable">AL</span>
MOV <span class="token register variable">AH</span>,<span class="token number">2</span>
INT <span class="token number">21H</span>
MOV <span class="token register variable">DL</span>,<span class="token number">0DH</span>
MOV <span class="token register variable">AH</span>,<span class="token number">2</span>
INT <span class="token number">21H</span>
MOV <span class="token register variable">DL</span>,<span class="token number">0AH</span>
MOV <span class="token register variable">AH</span>,<span class="token number">2</span>
INT <span class="token number">21H</span>
DEC <span class="token register variable">BL</span>
CMP <span class="token register variable">BL</span>,<span class="token number">0</span>
JZ A2
LOOP A1
<span class="token label function">A3:</span> MOV <span class="token register variable">AH</span>,<span class="token number">4CH</span>
INT <span class="token number">21H</span>
<span class="token label function">A2:</span> INT <span class="token number">32</span>
JMP A3
MAIN ENDP
INT0 PROC FAR
LEA <span class="token register variable">DX</span>,STRING
MOV <span class="token register variable">AH</span>,<span class="token number">9</span>
INT <span class="token number">21H</span>
MOV <span class="token register variable">BL</span>,<span class="token number">3</span>
IRET
INT0 ENDP
CODE ENDS
END MAIN
</pre><p><img src="./8/8-3.png" alt></p>
<h5 class="mume-header" id="2-%E6%9C%AC%E6%AC%A1%E5%AE%9E%E9%AA%8C%E4%B8%AD%E5%87%BA%E7%8E%B0%E4%BA%86%E5%93%AA%E4%BA%9B%E9%94%99%E8%AF%AF-%E5%A6%82%E4%BD%95%E6%8E%92%E9%99%A4">(2) 本次实验中,出现了哪些错误? 如何排除?</h5>
<p>无.<br>
无需排除.</p>
<h3 class="mume-header" id="%E4%BA%8C-%E5%8A%A0%E5%BC%BA%E5%9E%8B%E5%AE%9E%E9%AA%8C-1">二. 加强型实验</h3>
<h4 class="mume-header" id="1-%E5%AE%9E%E9%AA%8C%E7%9B%AE%E7%9A%84-3">1. 实验目的</h4>
<ol>
<li>中断服务子程序的编写.</li>
<li><strong>BIOS</strong> 和 <strong>DOS</strong> 中断调用.</li>
<li>实时时钟显示的实现.</li>
</ol>
<h4 class="mume-header" id="2-%E5%AE%9E%E9%AA%8C%E5%86%85%E5%AE%B9-3">2. 实验内容</h4>
<p>采用软中断处理程序实现实时时钟显示,每隔一秒更新实时显示时间.</p>
<h4 class="mume-header" id="3-%E5%AE%9E%E9%AA%8C%E4%BB%AA%E5%99%A8%E8%AE%BE%E5%A4%87-3">3. 实验仪器设备</h4>
<ul>
<li>硬件环境: AMD Ryzen 9.</li>
<li>软件环境: Windows XP Pro SP3 (in VMware Workstation 16 Pro).</li>
<li>编辑程序: Visual Studio Code 1.62.3.</li>
<li>调试程序: <code>DEBUG.EXE</code>.</li>
<li>编译程序: <code>MASM.EXE</code>.</li>
<li>连接程序: <code>LINK.EXE</code>.</li>
</ul>
<h4 class="mume-header" id="4-%E5%AE%9E%E9%AA%8C%E6%AD%A5%E9%AA%A4-3">4. 实验步骤</h4>
<ol>
<li>检查并修改原程序</li>
<li>编译连接和运行<br>
<img src="./8/8-4.png" alt></li>
</ol>
<h4 class="mume-header" id="5-%E6%80%9D%E8%80%83%E9%A2%98-2">5. 思考题</h4>
<h5 class="mume-header" id="1-%E5%AF%B9%E7%A8%8B%E5%BA%8F%E5%81%9A%E4%BF%AE%E6%94%B9%E8%AF%BB%E5%8F%96%E5%B9%B4%E6%9C%88%E6%97%A5%E6%97%B6%E9%97%B4%E5%AE%9E%E7%8E%B0%E8%AE%A1%E6%95%B0%E4%B8%80%E5%88%86%E9%92%9F%E6%9B%B4%E6%96%B0%E6%98%BE%E7%A4%BA%E6%97%B6%E9%97%B4%E8%BF%99%E6%97%B6%E5%BA%94%E8%AF%A5%E4%BF%AE%E6%94%B9%E7%A8%8B%E5%BA%8F%E4%B8%AD%E7%9A%84%E4%BB%80%E4%B9%88%E5%9C%B0%E6%96%B9">(1) 对程序做修改,读取年月日时间,实现计数一分钟,更新显示时间,这时应该修改程序中的什么地方?</h5>
<p><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>60</mn><mo>∗</mo><mn>1000</mn><mi mathvariant="normal">/</mi><mn>55</mn><mo>=</mo><mn>1090.909090909091</mn><mo>≈</mo><mn>1091</mn><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">60*1000/55=1090.909090909091\approx1091,</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.64444em;vertical-align:0em;"></span><span class="mord">60</span><span class="mspace" style="margin-right:0.2222222222222222em;"></span><span class="mbin">∗</span><span class="mspace" style="margin-right:0.2222222222222222em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord">1000/55</span><span class="mspace" style="margin-right:0.2777777777777778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2777777777777778em;"></span></span><span class="base"><span class="strut" style="height:0.64444em;vertical-align:0em;"></span><span class="mord">1090.909090909091</span><span class="mspace" style="margin-right:0.2777777777777778em;"></span><span class="mrel">≈</span><span class="mspace" style="margin-right:0.2777777777777778em;"></span></span><span class="base"><span class="strut" style="height:0.8388800000000001em;vertical-align:-0.19444em;"></span><span class="mord">1091</span><span class="mpunct">,</span></span></span></span> 故将 <code>NEXT</code> 中 <code>MOV COUNT,18</code> 的 <code>18</code> 改为 <code>1091</code> ,再输出年月日即可.<br>
<img src="./8/8-5.png" alt></p>
<h5 class="mume-header" id="2-%E6%9C%AC%E6%AC%A1%E5%AE%9E%E9%AA%8C%E4%B8%AD%E5%87%BA%E7%8E%B0%E4%BA%86%E5%93%AA%E4%BA%9B%E9%94%99%E8%AF%AF-%E5%A6%82%E4%BD%95%E6%8E%92%E9%99%A4-1">(2) 本次实验中,出现了哪些错误? 如何排除?</h5>
<p>无.<br>
无需排除.</p>
</div>
</body></html>